Wash temperature guide
Every dot or number inside a washtub sets a maximum, not a target. Use the full scale below, then choose a setting at or under that ceiling according to color, soil, detergent, and the water your machine actually delivers.
Start with the ceiling
The washtub gives the washing instruction. Dots or a number inside it set the hottest water the manufacturer permits for that garment. A 40C maximum allows a 30C wash. A 30C maximum does not allow 40C. Cooler water is allowed within a wash instruction, but it does not promise a cleaning result. Detergent makers and care guides point to factors such as soil, detergent, contact time, and machine action. The symbol itself states the maximum and process, not how those factors will perform.
International labels commonly print 30, 40, 50, 60, 70, or 95 in degrees Celsius. US symbol labels use one through six dots for the same maximums. Words such as cold, warm, and hot vary across machines and charts, so the number or dot count is the reliable part. Start with how to read a care label if the surrounding shapes are unfamiliar, and use compare when a dot and a cycle bar look alike.
The complete wash-temperature scale
Read every row as no hotter than the stated value. The Fahrenheit figures are ASTM's standardized pairings, not exact Celsius-to-Fahrenheit conversions. The final column is practical context, not part of the standardized symbol meaning.
The detailed references are one dot, two dots, three dots, four dots, and six dots. The five-dot 70C / 160F row is also part of the standard scale. Every row states only a maximum; none certifies disinfection or sanitization.
| Dots inside tub | Celsius maximum | ASTM Fahrenheit pairing | Typical wording or context |
|---|---|---|---|
| 1 dot | 30C | 80F | Often called cold; frequently chosen for darks, brights, and many everyday garments |
| 2 dots | 40C | 105F | Often called warm; commonly used for colorfast mixed loads |
| 3 dots | 50C | 120F | Often called hot; may suit sturdy whites, towels, or bed linen when their labels permit it |
| 4 dots | 60C | 140F | Sometimes called very hot or extra hot; may suit heavily soiled sturdy textiles when labeled for it |
| 5 dots | 70C | 160F | May appear on institutional linen or workwear and is less common on everyday clothing; do not equate it with a Sanitize preset by name alone |
| 6 dots | 95C | 200F | Often called boil wash; intended for very sturdy white cotton or linen specifically labeled for it |
Translate the mark into a real machine
Many washing machines show names such as Tap Cold, Cold, Warm, Hot, or Sanitize instead of degrees. Those names are not standardized temperature values. Targets are model-specific, so check the machine manual for how that model blends or heats water.
Depending on the model, a Cold preset may sit well below the one-dot 30C maximum, while a Hot or Sanitize preset may exceed a one- or two-dot ceiling. A lower setting remains within the label, but some detergents need a different dose or contact time in colder water. When the machine displays degrees, choose the marked maximum or lower. When it displays words, use the manual's target rather than assuming every brand uses the same blend.
A plain machine-wash tub with no temperature mark does not state a ceiling. That does not make maximum heat necessary. Choose the temperature that fits the soil and detergent, then obey every written warning on the tag.
Mixed loads inherit the strictest instruction in the drum. If one garment has a 30C maximum and the rest allow 40C, the load must stay at 30C or below. Cycle restrictions work the same way: two bars under one tub require a very mild process for everything washed with it. A machine may name that setting Delicate. Splitting the outlier into another load is often better than asking a low-action cycle to clean heavy towels. Temperature, action, load size, and detergent work together; lowering one may require more attention to the others, but none can be raised past the garment's stated limit.
Bars change action, not temperature
Position separates the instructions. Dots and numbers sit inside the tub and govern maximum heat. Bars sit below it and govern mechanical action. One symbol may carry both, and both apply. A tub with 40 and one bar means a 40C maximum plus an ISO mild process or a US permanent-press cycle.
Plain tub
Normal machine wash permits a normal washing process. If no dots or number appear, the symbol states no temperature ceiling; check for written limits.
One bar below
One bar marks an ISO mild process with reduced mechanical action. On a US label, permanent press is the corresponding terminology. The bar says nothing about temperature, so read inside the tub too.
Two bars below
Two bars mark a very mild washing process. Choose a machine program that meets the garment and machine instructions. The symbol does not prescribe one universal spin speed.
Hand in the tub
Hand wash changes the method. ISO 3758:2023 has ambient-temperature and maximum-40C variants; the US glossary permits an unqualified hand-wash instruction up to 150F / 66C. For practical care, choose cool water within every printed limit unless the garment or product directions say otherwise. A machine program named Hand Wash is not proof by name alone that it performs a by-hand wash.
X over the tub
Two crossing diagonal strokes forming an X mean no water washing. The crossed tub alone neither requires nor permits professional cleaning. Read every remaining symbol and written instruction for any supported route.
Setting decision checklist
Once you know the lowest ceiling in the load, use this checklist to decide how far below it to run. The goal is a setting that respects every label and still gives the detergent and cycle a fair chance to clean.
- Find the lowest maximum in the load and do not exceed it for any item.
- Separate new, dark, saturated, and hand-dyed pieces from pale items.
- If the garment or product guidance allows a colorfastness check, a hidden-seam blot with the intended detergent may expose color transfer. Treat transfer as a stop signal, but do not treat a clean blot as proof that the whole garment is safe to wash.
- Pre-treat visible soil. Grease, body oil, and heavy mud may need a compatible pre-treatment or longer contact time when the label ceiling is low.
- Read detergent directions for the temperature you selected. Cooler water may require a cold-water formula, a changed dose, or more time.
- Read bars below the tub and choose the required cycle independently of temperature.
- Translate the ceiling into the controls on this machine; do not trust preset names blindly.
- Load loosely enough for water and detergent to reach the fabric.
- Inspect every treated spot while wet. Never tumble dry until a stain is completely gone.
- If soil remains, re-treat or rewash within the label rather than exceeding the maximum.
Common temperature mistakes
The first mistake is overriding a low maximum to chase odor or heavy soil. Hotter-than-suitable water can shrink, fade, or wrinkle some fabrics, but the exact response varies. Use compatible pre-treatment and detergent directions rather than exceeding the tag. The shrinkage guide explains why water and mechanical action can also matter.
The second mistake is treating a preset name as a standard. Depending on the machine, Whites, Heavy Duty, or Sanitize may use a different water temperature. Check that model's manual. The third is counting a bar under the tub as a dot, then choosing the wrong heat and action at once. The fourth is assuming a low-temperature wash cannot clean. Results depend on the stain and detergent, so inspect the load and adjust within the label rather than guessing.
If a mistake already happened, stop before the dryer and use the consequence and triage guide. The drying family sets a separate maximum for the next stage.
Common questions
What temperature is two dots on a washing label?
Two dots mean a 40C maximum, shown as about 105F on common US care charts. The item may be washed cooler within that washing instruction. Whether a cooler cycle cleans the soil depends on detergent, pre-treatment, time, and machine action.
Can I wash a 40C item at 30C?
Yes, because 40C is the maximum, not a required target. A 30C wash stays within that temperature instruction. The reverse is not true. Pre-treat visible soil and follow the detergent directions for the lower setting.
What do lines under the washing symbol mean?
They govern cycle action, not water heat. One bar means an ISO mild process or US permanent press. Two bars mean a very mild process, often represented by a delicate or gentle setting. Read the bars together with any dots or number inside the tub, because the required action and maximum temperature both apply.
Which washer setting equals a 30C maximum?
A machine displaying degrees can be set to 30C or lower. On a word-only dial, the target for Cold, Warm, or another preset is model-specific. Check the manual or a documented target instead of assuming a named setting fits the one-dot ceiling.
Guidance follows American Cleaning Institute , Woolmark care guides , FTC Care Labeling Rule and GINETEX care labelling . A guide, not a guarantee. Always defer to your garment’s own care label.